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DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 item	Dec. 31, 2012
Fair value of net derivatives
Derivative Liabilities, current	$ (1,718)	$ (385)
Derivative's Credit risk
Number of counterparties to the commodity derivative contracts	1
Commodity derivatives \| Not designated as hedging instruments
Fair value of net derivatives
Derivative Liabilities	(2,418)	(952)
Commodity derivatives \| Not designated as hedging instruments \| Oil
Fair value of net derivatives
Derivative Liabilities, current	3	72
Derivative Liabilities, Non-current		(567)
Commodity derivatives \| Not designated as hedging instruments \| Natural Gas
Fair value of net derivatives
Derivative Liabilities, current	(1,721)	(457)
Derivative Liabilities, Non-current	$ (700)

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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- Definition

Fair value of liability arising from contracts that meet the criteria of being accounted for as derivative instruments, financial instrument or contract used to mitigate a specified risk (hedge), energy marketing activities (trading activities), expected to be settled after one year or beyond the normal operating cycle, if longer. Examples of energy marketing activities include, but are not limited to, trading of electricity, coal, natural gas and oil using financial instruments, including, but not limited to, forward contracts, options and swaps.

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